Bit of a tricky question.
I run a WP site with many different Post Categories. We would like users to be able to signup to receive email updates when new posts are added to categories.
In the past I have used Feedburner or MailChimp RSS Broadcast for users to signup to updates to specific RSS feeds.
What I would like to do is have a subscription form with checkboxes for each category and the user can then select which categories are of interest to them.
As you can imagine there are many combinations/permutations or categories and so this would have to work dynamically.
I haven't found a plugin which manages all of this, as yet. Any idea where to start? Is this even possible?